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directrix

[dih-rek-triks, dahy-] /dɪˈrɛk trɪks, daɪ-/
noun, plural directrixes, directrices
[dih-rek-tri-seez, dahy-, dahy-rek-trahy-seez] /dɪˈrɛk trɪˌsiz, daɪ-, ˌdaɪ rɛkˈtraɪ siz/ (Show IPA)
1.
Geometry. a fixed line used in the description of a curve or surface.
2.
Archaic. a directress.
Origin
1615-1625
1615-25; < Neo-Latin; see direct, -trix
Usage note
See -trix.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for directrix
  • Derive the equation of a parabola given a focus and directrix.
British Dictionary definitions for directrix

directrix

/dɪˈrɛktrɪks; daɪ-/
noun
1.
(geometry) a fixed reference line, situated on the convex side of a conic section, that is used when defining or calculating its eccentricity
2.
a directress
Word Origin
C17: New Latin, feminine of director
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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directrix in Science
directrix
  (dĭ-rěk'trĭks)   
A straight line used in generating a curve such as a parabola.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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